質問編集履歴
2
修正
title
CHANGED
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File without changes
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body
CHANGED
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@@ -138,7 +138,7 @@
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138
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render() {
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return(
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<div>
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141
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-
<button onClick={() => {this.buttonClick();}>ボタン</button>
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141
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<button onClick={() => {this.buttonClick();}}>ボタン</button>
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142
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</div>
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);
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}
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1
コードの追加
title
CHANGED
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@@ -1,1 +1,1 @@
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1
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子のcomponent
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1
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+
子のcomponentから親のstateを更新させた後に子が持ってるpropsを更新させたい
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body
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@@ -1,2 +1,149 @@
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1
1
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あるcomponentでcomponentWillUpdate()をし、
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2
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-
state、またはpropsが更新されたタイミングで子のcomponentにpropsで親のcomponentのstateを渡したいのですがどうすればできますか？
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2
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state、またはpropsが更新されたタイミングで子のcomponentにpropsで親のcomponentのstateを渡したいのですがどうすればできますか？
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3
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4
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## コード
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5
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親component
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6
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```
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7
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import React from 'react';
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8
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import PropTypes from 'prop-types';
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9
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import component1 from './component1';
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import component2 from './component2';
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11
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12
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class parent extends React.Component {
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constructor(props) {
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super(props);
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16
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this.state = {
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array: [
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{ test: 'test1', test1: false, index: 0},
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{ test: 'test2', test1: false, index: 1},
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{ test: 'test3', test1: false, index: 2},
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],
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};
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}
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onSubmitState() {
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this.setState({
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array: [
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{ test: 'aaa', test1: true, index: 0},
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{ test: 'bbb', test1: true, index: 1},
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{ test: 'ccc', test1: true, index: 2},
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],
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});
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}
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cmp1Props(obj) {
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return (
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<component1
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cmp1Props={obj}
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/>
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);
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}
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cmp2Props(obj) {
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return (
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<component2
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cmp2Props={obj},
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onSubmitState={() => {this.onSubmitState();}}
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/>
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);
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}
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render() {
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const cmp1 = this.state.array.map((e) => {
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return (
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this.cmp1Props(e)
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);
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});
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+
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const cmp2 = this.state.array.map((e) => {
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return (
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this.cmp2Props(e)
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);
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});
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+
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return (
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<div>
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{cmp1}
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{cmp2}
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</div>
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);
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}
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}
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73
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74
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export default parent;
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75
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```
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76
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77
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component1(子)
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78
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```
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79
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import React from 'react';
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80
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import PropTypes from 'prop-types';
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81
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82
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class component1 extends React.Component {
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83
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static propTypes = {
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84
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cmp1Props: PropTypes.object,
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85
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};
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86
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+
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87
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constructor(props) {
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super(props);
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this.state = {
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91
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test: this.props.cmp1Props.test,
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test1: this.props.cmp1Props.test1,
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};
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94
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}
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95
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+
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96
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render() {
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97
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if(this.state.test1) {
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98
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return(
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99
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<div>
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100
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<p>成功</p>
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101
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</div>
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102
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);
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103
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} else {
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104
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return(
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105
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<div>
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106
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<p>失敗</p>
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107
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</div>
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108
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);
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109
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}
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110
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}
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111
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}
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112
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113
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export default component1;
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114
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```
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115
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+
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116
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+
component2(子)
|
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117
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+
```
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|
118
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+
import React from 'react';
|
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119
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import PropTypes from 'prop-types';
|
|
120
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+
|
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121
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const propTypes = {
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122
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cmp2Props: PropTypes.object,
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123
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onSubmitState: PropTypes.func
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124
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};
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125
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+
|
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126
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class component2 extends React.Component {
|
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127
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constructor(props) {
|
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128
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super(props);
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129
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+
this.state = {
|
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130
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+
index: this.props.cmp2Props.index,
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131
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+
};
|
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132
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+
}
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133
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+
|
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134
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+
buttonClick() {
|
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135
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return this.props.onSubmitState();
|
|
136
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+
}
|
|
137
|
+
|
|
138
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+
render() {
|
|
139
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+
return(
|
|
140
|
+
<div>
|
|
141
|
+
<button onClick={() => {this.buttonClick();}>ボタン</button>
|
|
142
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+
</div>
|
|
143
|
+
);
|
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144
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+
}
|
|
145
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+
}
|
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146
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+
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147
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+
component2.propTypes = propTypes;
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148
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+
export default component2;
|
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149
|
+
```
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